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Finding the Fourth Proportional to 80,640.46, 120,963.42 and 28,050.40

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Solution

The fourth proportional to 80,640.46, 120,963.42 and 28,050.40 is: 42,076.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,640.46 : 120,963.42 = 28,050.40 : x
  2. Step 2: Convert to fraction form
    80,640.46/120,963.42 = 28,050.40/x
  3. Step 3: Cross multiply
    80,640.46x = 120,963.42 × 28,050.40
  4. Step 4: Simplify right side
    80,640.46x = 3,393,072,316.37
  5. Step 5: Solve for x
    x = 3,393,072,316.37/80,640.46
  6. Step 6: Final answer
    x = 42,076.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.